反相微乳液水热法合成锐钛矿TiO_2微球及其光催化性能

Reverse microemulsion hydrothermal synthesis and photocatalytic properties of anatase TiO_2 microspheres

以钛酸丁酯(TBT)为钛源、辛烷基苯酚聚氧乙烯醚(Triton X-100)为表面活性剂,采用反相微乳液水热法制备锐钛矿TiO2微球,并研究了反应体系中水含量对锐钛矿TiO2微球性能的影响。采用X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、场发射扫描电子显微镜(FE-SEM)、透射电子显微镜(TEM)、荧光光谱(PL)对锐钛矿TiO2微球的结构、形貌和物相等进行表征。结果表明,在一定范围内增加钛酸丁酯/水(TBT/H2O)的摩尔比,锐钛矿TiO2微球形貌由无规则形态向规则形貌转变,颗粒尺寸也随之变均匀。同时,以亚甲基蓝为目标降解物,对其光催化活性进行评价,结果表明,颗粒尺寸和形貌的变化对其催化活性有较大影响,当TBT/H2O摩尔比为1∶25时,微球尺寸均匀,催化活性最好,优于商业化P25。

Highly crystalline anatase TiO2 microspheres were prepared by a reverse microemulsionhydrothermal method using tetrabutyl titanate as the titanium source and Trition X-100 as the surfactant.The phase and crystal structure,surface morphology of the prepared TiO2 microspheres were characterized by X-ray diffraction（XRD）,Fourier transform infrared spectrometry（FT-IR）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM） and photoluminescence（PL） spectroscopy,respectively.The results show that with the increase of the molar ratio TBT /H2 O within a certain range,the TiO2 microspheres transformed from the irregularly shape to the regularly structure,and the particle size also became uniform.The photocatalytic activity of TiO2 microspheres was evaluated in the degradation of methyl blue.It was found that particle size and morphology changes have great impact on the photocatalytic activity.When TBT /H2 O molar ratio is 1∶ 25,the size of microsphere is uniform,and the photocatalytic activity is the optimum,superior to that of commercial P25.